Mechanism



(No Model.) 2 Sheets-Sheet 1.

J. TREGONING. VALVE OPERATING MECHANISM.

No. 462,805. Patented Nov. 10, 1891.

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(No Model.) I r 2 Sheets- Sl1eet 2.

J. TREGONING. VALVE OPERATING MEGHANISM.

No. 462,805. Patnted Nov. 10,1891.

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PATENT OFFICE.

JOHN TREGONING, OF LYNN, MASSACHUSETTS, ASSIGNOR Oh ONE-HALF TO JAMES T.LENNOX, OF SAME PLACE.

VALVE-OPERATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 462,805, dated November10, 1891.

Application filed April 29, 1891. Serial No. 390,936. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN TREGONING, a citizen of the United States, aresident of Lynn, in the Commonwealth of Massachusetts, have invented anew and useful Improvement in Valve-Operating Devices, of which thefollowing is a specification.

My invention relates to improvements in devices of the above elass,inwhich a pistonred having annular grooves on one side of the pistonextending through the head of the cylinder acts as a valve, opening andclosing' passages communicating; with exhaustports in the steam-chest,and leading across the cylinder-head through the opening in which thepiston-rod slides to the exhaust-receiver or atmosphere.

' In the accompanying drawings, which illustratemy invention, Figure 1is aview thereof, taken partially in section through center of maincylinder and partially in section through center of the steam-chest andpartially in elevation. Fig. 2 is a section through the center of thesteanrcliest, showing also a right section of the main cylinder. Fig. 3is a section of the main cylinder.

Similar letters refer to similar parts throughout the several views.

Referring to the drawings, A is the main cylinder, and B is acylindrical steam-chest mounted thereon, and preferably placed at rightangles, or nearly so, thereto.

In the steamchest B is the piston (1, inside of which and operatedthereby is the valve D, which is similar to the ordinary D-Valve, and bymeans of which the steam is admitted into and exhausted from thecylinder in the usual way. Near the heads of the steamchest 13 are theexhaust-ports p and 79 communicating With the passages s ands,respectively, which lead along the cylinder A and across the headthereof, and through the opening in which the piston-rod slides, and arecontinued beyond the same and until they communicate with theexhaust-receiver or directly with the atmosphere. Except in positionshereinafter set forth, the passages s and s are closed by thepiston-rod.

In the main cylinder A is a piston of the usual form, to which issecured the pistonrod E, which passes through the head of the cylinderA, in which are the passages s and s, and which is provided withspring-packing which surrounds the rod E and prevents leakage of steaminto passages s and s. p In the red E is an annular groove 0, placed atsuch distance from the piston that at the limit of the stroke it willcoincide with the passage .9. The rod E is further provided with anotherannular groove 0, which, at the extrem- 6o ity of the reverse stroke,coincides with the passage 8. The passages s and .5" pass through theopening in the cylinder-head, through which the piston rod E slides atdifierent distances from the plane of the inner face thereof, and canonly coincide with the annular grooves 0 and 0', as hereinbefore setforth.

The operation of my invention is as follows: \Vhen steam is admittedinto the steamchest B it passes over the valve D into cylin- 7o der A.\Vhen the piston reaches the limit of its stroke, the groove 0,coinciding with the passage 3, connects the exhaust-portp' with theexhaust-receiver or directly with the atmosphere, and the steam whichhas leaked by the piston C will drive it over and operate the valve D,opening the exhaust and admitting steam to the other end of thecylinder. At the extremity of the reverse stroke the groove'o coincideswith the passage 3, and the operation of the piston O and the valve D isreversed.

My present invention I consider limited to forms of valxe-operatingdevices in which the annular grooves are both on the same side of thepiston, and in which it is not necessary to extend the piston-rodthrough the back head of the cylinder, and in which both passages fromthe exhaustports in the steamehest lead to the same head of thecylinder.

I make this limitation in view of Letters Patent of the United StatesNo.193,736, dated July 31,1877, and granted to me for improvements insteam-valves in pumping-engines.

I claim as my invention and desire to secure by Letters Patent- In a,valveoperating device, the combinaand the valve D,all substantially asset forth, tion of the piston-rod E, having the annular and for thepurposes specified. grooves 0 and 0 on the same side of the pis- Datedat Lynn, thls 18th day of April, 189]. I0

ton, the passages s and s, crossing the same JOHN TREGONING. 5 head ofthe cylinder, the steam-chest B, hav- 'Witnesses: V

ing exhaust-ports communicating with the WINFIELD S.PARTRIDGE,

passages s and s, respectively, the piston (J, ALFRED SMITH.

